单项选择题
A.crossing your course in the same direction B.crossing your course in opposite directions C.parallel to the pier from ahead D.setting you on the pier
A.Directly in line with the bow B.Side by side，with their lines on the port and starboard side C.So that their lines form an angle D.On top of one another
A.They occur when the Sun is at minimum declination north or south B.They occur when the Moon is at maximum declination north or south C.The difference in height between consecutive high or low tides is at a minimum D.They are used as the basis for the vulgar establishment of the port